The first flight on Mars will happen in April 2021 with the Ingenuity helicopter flying about one storey high for 60 seconds. It is part of the Perseverance mission rover that has already landed on the planet Mars. This video in WSJ shows how the Ingenuity helicopter was developed by NASA using a contractor Aeroenvironment which specializes in unmanned flight vehicles. The development process took 7 years and testing was done at the JPL Labs. JPL Labs has a vacuum space that can be filled with CO2 similar to atmosphere on MARS.
Engineers doing the work for the helicopter say flight on MARS is challenging because of the thinner air. This will be a first in planetary flight compared to Wright Brothers first 120 second flight.